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Disallow pinch zooming beyond min/max resolution

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This commit is contained in:
Tim Schaub
2017-02-03 12:56:03 -07:00
parent 259fc356bc
commit d713c9fea6
1 changed files with 16 additions and 5 deletions
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21
src/ol/interaction/pinchzoom.js
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@@ -81,13 +81,25 @@ ol.interaction.PinchZoom.handleDragEvent_ = function(mapBrowserEvent) {
scaleDelta = this.lastDistance_ / distance;
}
this.lastDistance_ = distance;
if (scaleDelta != 1.0) {
this.lastScaleDelta_ = scaleDelta;
}
var map = mapBrowserEvent.map;
var view = map.getView();
var resolution = view.getResolution();
var maxResolution = view.getMaxResolution();
var minResolution = view.getMinResolution();
var newResolution = resolution * scaleDelta;
if (newResolution > maxResolution) {
scaleDelta = maxResolution / resolution;
newResolution = maxResolution;
} else if (newResolution < minResolution) {
scaleDelta = minResolution / resolution;
newResolution = minResolution;
}
if (scaleDelta != 1.0) {
this.lastScaleDelta_ = scaleDelta;
}
// scale anchor point.
var viewportPosition = map.getViewport().getBoundingClientRect();
@@ -98,8 +110,7 @@ ol.interaction.PinchZoom.handleDragEvent_ = function(mapBrowserEvent) {
// scale, bypass the resolution constraint
map.render();
ol.interaction.Interaction.zoomWithoutConstraints(
view, resolution * scaleDelta, this.anchor_);
ol.interaction.Interaction.zoomWithoutConstraints(view, newResolution, this.anchor_);
};